Thursday, December13, 2018 L-36.com


Marine Weather and Tides
Roosevelt Park, MI

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 8:07AMSunset 5:11PM Thursday December 13, 2018 2:42 PM EST (19:42 UTC) Moonrise 12:30PMMoonset 11:10PM Illumination 37% Phase: Waxing Crescent; Moon at 6 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
    EDIT      (on/off)   Help
LMZ847 Grand Haven To Whitehall Mi- 1029 Am Est Thu Dec 13 2018
Rest of today..Southeast winds 10 to 15 knots. Mostly cloudy. Waves 1 to 2 feet.
Tonight..Southeast winds around 10 knots backing northeast toward daybreak. A chance of rain showers in the evening, then rain showers likely overnight. Waves 1 to 2 feet.
Friday..North winds 5 to 10 knots. Mostly cloudy with a slight chance of rain showers until midday, then mostly Sunny in the afternoon. Waves 1 foot or less.
Friday night..Northeast winds 5 to 10 knots. Partly cloudy. Waves 1 foot or less.
LMZ847 Expires:201812132215;;734954 FZUS53 KGRR 131529 NSHGRR Nearshore Marine Forecast National Weather Service Grand Rapids MI 1029 AM EST Thu Dec 13 2018 For waters within five nautical miles of shore on Lake Michigan LMZ847-132215-


7 Day Forecast for Marine Location Near Roosevelt Park, MI
   Hourly   EDIT   Help
location: 43.22, -86.36     debug


Area Discussion for - Grand Rapids, MI
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus63 kgrr 131810
afdgrr
area forecast discussion
national weather service grand rapids mi
110 pm est Thu dec 13 2018
latest update...

aviation hydro

Synopsis
Issued at 315 am est Thu dec 13 2018
- rain showers tonight into Friday morning south of i-96
- wintry mix of light snow and or light freezing rain possible
near to mainly north of i-96 tonight
- tranquil and seasonably mild weather Saturday through Wednesday

Update
Issued at 1105 am est Thu dec 13 2018
morning model guidance still suggests a few-hour window of light
freezing rain mainly north of i-96 at the onset of precip tonight,
beginning after midnight there. All rain is expected south of
i-96. There are factors working for and against the freezing rain
potential which will likely make ice accretion on roads rather
non-uniform (even without considering chemical treatment).

Clearing persists around i-94 and us-127 currently, helping
temperatures at mt pleasant rise above 32, while clear skies
overnight around big rapids have now clouded over, trapping air in
the mid-20s. It's possible that pavement temperatures lingering
below freezing in parts of the area, especially in valleys, could
help make roads temporarily slick even in marginally warm air
temperatures. On the other hand, surface winds tonight will be nil
to even slightly warm advective, and the depth of the sub-
freezing surface air looks very shallow, so the latent heat
release from freezing rain will be a self-defeating process. With
the uncertainty and likely short time window for ice in the middle
of the night, no advisory is going to be issued at this time,
though trends will be evaluated through the day.

Discussion (today through next Wednesday)
issued at 315 am est Thu dec 13 2018
primary short term fcst concerns involve determining potential for
light snow and or light freezing rain tonight.

Rain showers will develop south of i-96 this evening in an area
of isentropic upglide north of the warm front over the lower great
lakes region. Thermal profiles fcst soundings from 00z high res
guidance show potential for a bit of light freezing rain and or
light snow near to (mainly) north of i-96.

Very light snow accumulations of around a half an inch or so are
possible late tonight to the north NE of kgrr up toward
krqb kmop. Light -fzra accumulations of several hundredths of an
inch are possible north to NE of kgrr tonight if p-type ends up
being more in the form of -fzra rather than light snow. Light pcpn
will linger into Friday morning and transition to plain rain
across our fcst area before ending as thermal profiles moderate.

The remainder of the fcst period looks very tranquil for this time
of year. A weak high pressure ridge will build in Friday afternoon
through Saturday and help to keep pcpn associated with the eastern
tn valley mid atlantic low pressure system Saturday to the SE of
our fcst area. Another high pressure ridge will then build in from
the west early next week and bring fair wx.

Aviation (for the 18z tafs through 18z Friday afternoon)
issued at 110 pm est Thu dec 13 2018
MVFR ceilings vis at mkg, grr, and lan should improve toVFR over
the next few hours into this evening. Ifr is likely with rain
tonight into part of tomorrow morning. While all TAF sites have
rain in the forecast, 2-meter temperatures near 0 degrees c at the
beginning of the precipitation at mkg, grr, and lan may create a
brief period of -rasn or -fzra. Ground-level icing is more likely
at airports to the north including rqb and mop, mainly within a
few hours of the precipitation beginning. Winds will be light from
the southeast becoming northeast during the forecast period.

Marine
Issued at 315 am est Thu dec 13 2018
offshore winds of around 5 to 15 kts through Saturday will result
in rather minimal wave heights of one to three feet through then.

Hydrology
Issued at 110 pm est Thu dec 13 2018
no hydro concerns are expected over the next week as water levels
on rivers remain near-normal for this time of year. Melting and
runoff of any remaining snow will be possible through the next
week as warmer temperatures arrive, but this shouldn't have much
of an impact on river levels. Otherwise rain and possibly a
rain snow mix will be possible late tonight into early Friday, but
rainfall amounts still appear to be below one-half inch.

Therefore some streams may rise, but nothing significant is
expected.

Grr watches warnings advisories
Mi... None.

Lm... None.

Update... Cas
synopsis... Laurens
discussion... Laurens
aviation... Cas
hydrology... Anh
marine... Laurens


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MKGM4 - Muskegon, MI 1 mi32 min S 6 G 8 37°F 1020.2 hPa30°F
HLNM4 - 9087031 - Holland, MI 32 mi48 min ESE 1.9 G 5.1 39°F 1018.3 hPa26°F
LDTM4 - 9087023 - Ludington, MI 50 mi42 min SE 4.1 G 6 35°F 29°F

Wind History for Holland, MI
(wind in knots)    EDIT      (on/off)   Help
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last
24hr
SE8
G15
S17
G21
S13
G16
W21
W18
W13
G17
W10
G14
W10
G14
W11
W6
G9
W6
G9
W6
N3
G6
SE3
SE4
E4
SE3
E5
SE5
SE5
S7
S4
S2
SW3
1 day
ago
N7
G10
NE4
NE6
NE7
E6
E7
E7
E4
E5
G8
SE5
G8
E8
G11
E10
G13
E14
E14
G17
E16
G20
E18
G23
E21
E19
G24
E16
E10
G19
SE12
G17
SE16
G20
SE11
G18
SE11
G15
2 days
ago
SW15
SW15
G19
SW17
G21
SW20
SW19
G25
SW20
G25
SW23
G29
SW22
G27
SW22
G28
SW26
W24
W24
W24
SW21
W18
G23
SW19
W18
W16
G20
W12
G20
W14
G18
W14
W11
G14
NW9
NW9

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Muskegon, Muskegon County Airport, MI6 mi47 minSE 66.00 miOvercast with Haze38°F28°F70%1019.5 hPa

Wind History from MKG (wind in knots)
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
Last 24hrSE9SE10SE5W10SW7W6CalmSE4SE5SW5CalmE3E4E7SE4SE5SE6SE7SE6SE7S7SE7S6SE6
1 day agoNW4E3CalmSE5E4SE5SE5SE7SE7E6SE10------E12SE14
G20
E14SE17SE14SE17SE17
G23
SE14SE13
G18
SE7
2 days agoSW13SW11SW10SW9
G19
SW13SW14SW12
G22
SW14
G20
SW14
G22
W12
G23
W12
G22
W13
G20
W13
G20
W10W10W8W10W8W8W9W6NW8N6N6

Tide / Current Tables for
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help
Tide / Current Tables for
   EDIT      (on/off)   Help
Weather Map and Satellite Images
       (on/off)   HelpWeather Map
wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Grand Rapids, MI (14,3,4,5)
      (on/off)   Help

Ground Weather Radar Station Grand Rapids/Muskegon, MI
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.